Re: [stella] Difference between M0 & BL ?!?

Subject: Re: [stella] Difference between M0 & BL ?!?
From: Manuel Polik <cybergoth@xxxxxxxx>
Date: Tue, 22 Oct 2002 08:05:33 +0200
Hi Christopher!

>Manuel wrote:

>>Simply changing RESBL into RESM0 will destroy the 
>>explosion code of my ships. 
>Don't you also need to change:
>      STA HMM0

Yes. What I did was this, I changed everything 
completely, when I realized that the explosions get 
scrambled. Since I had no clue why this should happen, I 
finally took the original source and made all changes 
again, step-by-step. What I realized was, that it goes 
weird, when changing one of the BL acceses in that area 
to a M0 access.

The fact is, that by changing one single RESBL to RESM0 
my sprite pointers get altered, which are hold in the 
RAM. I have no clue at all how such a thing can happen. 
All RESXX registers are strobed write only, they can't 
*feedback* into RAM, can they?!? 

And it is happening only, when when my collision 
detection code is executed, which is working without any 
register, based on a timer & coordinate calculations, 
all of which are in the RAM and register & BL/M0 

I don't get it...


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